from my_utils import str_util,file_util

if __name__ == '__main__':
    # print(str_util.str_reverse("abcdefg"))
    # print(str_util.substr("abcdefg", 1, 3))
    file_util.print_file_info("hello.txt")
    file_util.append_to_file("hello.txt","\nhohoho2")